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1970 400 heads on a 1972 455 block

02-06-18, 11:34 AM

I had a 455 engine built and they used 400 heads from a 1970 GP with big valves. Now I am told the heads build too much compression. One of my problems is I paid to have the heads ported and that was $600.00 more. Pistons are flat tops and cam is a Comp 268 dur./454 lift. I am looking for help. What can I do. Is my money lost ? Thanks for any help.

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it is hard to give a reply you did not say what heads { 48, 16, 12, they are not the same] you did not say if the 455 was stock bore or hog out by .060
but going on a 455 you will be ok with good gas 93

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Thanks onebad65, the bore is stock and the heads are either 12's or 13's. with 72 cc. Engine is in storage and not here with me. I had read that these heads would put me in the 11 1/2 to 12 cr. You can read so much and see so many views that I figured I should ask.